Cadmium telluride (CdTe) belongs to the II-VI semiconductors family, together with other notable compounds such as cadmium sulfide (CdS), zinc oxide (ZnO) or zinc selenide (ZnSe). Its direct bandgap of 1.5 eV at room temperature matches perfectly the requirement for highly efficient sunlight energy conversion, allowing a theoretically predicted maximum efficiency of around 32 %.
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